Donald L Gay

US Patent:

41602722, Jul 3, 1979

Filed:

Jan 5, 1978

Appl. No.:

5/867214

Inventors:

Frank J. Thomas - Wellesley Hills MA
Donald L. Gay - Daytona Beach FL
Chester A. Winsor - Orlando FL

Assignee:

Martin Marietta Corporation - Orlando FL

International Classification:

G06J 100

US Classification:

364602

Abstract:

A digital voltage accumulator functioning to store a digital signal over an extended period of time, the digital signal representing the accumulated sum of values of an analog input signal as sampled during the period of time following system reset command. The accumulator is capable of selectively incrementing or decrementing the stored signal, following an update command, in response to amplitude and polarity changes in the analog input signal. Signal storage is effected using a digital counter and a bipolar digital to analog converter. The analog equivalent to the stored digital signal is arithmetically summed with the analog input signal. Update is accomplished by comparing this summed signal with the analog equivalent of the stored digital signal upon command. The digital counter increments when the sum signal is positive relative to the stored signal and decrements when the sum signal is negative relative to the stored signal. The update cycle stops when the comparator senses that the stored digital signal equals the arithmetic sum of the analog input signal plus the old value of the stored digital signal.

US Patent:

43162185, Feb 16, 1982

Filed:

Mar 28, 1980

Appl. No.:

6/134858

Inventors:

Donald L. Gay - Daytona Beach FL

Assignee:

The United States of America Government as represented by the Secretary
of the Army - Washington DC

International Classification:

H04N 718

US Classification:

358125

Abstract:

Electrical control system for a video tracker, including circuitry for maintaining the size of the target substantially constant relative to the tracking window, thereby improving the accuracy of the target shift detection circuit. Additional circuitry is provided for enhancing contrast between the target and the background scene, thus preventing loss of the target due to inadvertant sensing of grey clutter instead of the true target.